/**************************************************************************************************
	$Header: /pub/cvsroot/mydns/lib/passinput.c,v 1.3 2002/05/26 01:02:28 bboy Exp $
	passinput.c: Read a password from standard input.

	Copyright (C) 2002  Don Moore <bboy@bboy.net>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at Your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**************************************************************************************************/

#include <signal.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>

#ifndef PASS_MAX
#	define PASS_MAX	128
#endif

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	PASSINPUT
	Prompts user to input password.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
char *
passinput(prompt)
	const char *prompt;
{
	static char buf[PASS_MAX + 1];
	char			*ptr;
	sigset_t		sig, sigsave;
	struct termios term, termsave;
	FILE			*fp;
	int			c;

	buf[0] = '\0';

	if (!isatty(STDIN_FILENO))
		return (buf);

	if (!(fp = fopen(ctermid(NULL), "r+")))
		return (buf);
	setbuf(fp, NULL);

	sigemptyset(&sig);
	sigaddset(&sig, SIGINT);
	sigaddset(&sig, SIGTSTP);
	sigprocmask(SIG_BLOCK, &sig, &sigsave);

	tcgetattr(fileno(fp), &termsave);
	term = termsave;
	term.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
	tcsetattr(fileno(fp), TCSAFLUSH, &term);

	fputs(prompt, stdout);
	fputs(": ", stdout);

	ptr = buf;
	while ((c = getc(fp)) != EOF && c != '\n')
	{
		if (ptr < &buf[PASS_MAX])
			*ptr++ = c;
	}
	*ptr = 0;
	putc('\n', fp);

	tcsetattr(fileno(fp), TCSAFLUSH, &termsave);
	sigprocmask(SIG_SETMASK, &sigsave, NULL);
	fclose(fp);
	return (buf);
}
/*--- passinput() -------------------------------------------------------------------------------*/

/* vi:set ts=3: */
